I see the same modeline setting for both of them, does that mean "same timing" ?
$ xrandr --verbose | grep '*current' -A 2
3840x2160 (0x4a) 533.250MHz +HSync -VSync *current +preferred
h: width 3840 start 3888 end 3920 total 4000 skew 0 clock 133.31KHz
v: height 2160 start 2214 end 2219 total 2222 clock 60.00Hz
--
3840x2160 (0x4a) 533.250MHz +HSync -VSync *current +preferred
h: width 3840 start 3888 end 3920 total 4000 skew 0 clock 133.31KHz
v: height 2160 start 2214 end 2219 total 2222 clock 60.00Hz
>
> [AMD Official Use Only - AMD Internal Distribution Only]
>
> The two high resolution panels have different timings so it's needed to be
> fixed to high memory clock level.
> @Li, Humphrey to further comment.
> Thanks.
>
>
> -----Original Message-----
> From: Jaroslav Pulchart <[email protected]>
> Sent: Tuesday, July 2, 2024 12:20 PM
> To: Feng, Kenneth <[email protected]>
> Cc: Alex Deucher <[email protected]>; [email protected]
> Subject: Re: High Power Consumption of AMD RX6800xt in Idle with Secondary
> Monitor Connected
>
> Caution: This message originated from an External Source. Use proper caution
> when opening attachments, clicking links, or responding.
>
>
> Hi,
>
> Yes, they are 4k monitors. Any reason for such and expected boost for them?
>
> BTW: I try to increase blanking periods for both monitors without any change.
>
> Jaroslav P.
>
> >
> > [AMD Official Use Only - AMD Internal Distribution Only]
> >
> > Hi Jaroslav,
> > Are both of your monitors 4K resolution?
> > Then most likely the memory clock is expected to be boosted.
> > Thanks.
> >
> >
> > -----Original Message-----
> > From: amd-gfx <[email protected]> On Behalf Of
> > Alex Deucher
> > Sent: Monday, July 1, 2024 11:07 PM
> > To: Jaroslav Pulchart <[email protected]>
> > Cc: [email protected]
> > Subject: Re: High Power Consumption of AMD RX6800xt in Idle with
> > Secondary Monitor Connected
> >
> > Caution: This message originated from an External Source. Use proper
> > caution when opening attachments, clicking links, or responding.
> >
> >
> > On Mon, Jul 1, 2024 at 3:25 AM Jaroslav Pulchart
> > <[email protected]> wrote:
> > >
> > > Dear AMD GPU Kernel Maintainers,
> > >
> > > I am writing to report an issue with high power consumption of my
> > > AMD RX6800xt graphics card when a secondary monitor is connected.
> > >
> > > Upon investigation, I observed that my desktop computer generates
> > > more heat while idling. I determined that the high power consumption
> > > issue arises when I connect a secondary monitor to my AMD RX6800xt
> > > card, causing it to consume approximately 40W of power in idle state .
> > >
> > > I checked the "GFX Clocks and Power:" in
> > > /sys/kernel/debug/dri/1/amdgpu_pm_info of my RX6800xt during idle,
> > > and here are the findings:
> > >
> > > With the secondary monitor connected memory frequency is up and
> > > constantly at 1000MHz:
> > > 1000 MHz (MCLK)
> > > 3 MHz (SCLK)
> > > 1825 MHz (PSTATE_SCLK)
> > > 1000 MHz (PSTATE_MCLK)
> > > 856 mV (VDDGFX)
> > > 45.00 W (average SoC)
> > >
> > > Single monitor connected:
> > > 96 MHz (MCLK)
> > > 0 MHz (SCLK)
> > > 1825 MHz (PSTATE_SCLK)
> > > 1000 MHz (PSTATE_MCLK)
> > > 6 mV (VDDGFX)
> > > 8.00 W (average SoC)
> > >
> > > The significant difference in power consumption between the two
> > > states indicates a potential issue in power management that needs to
> > > be addressed. Your assistance in resolving this matter would be
> > > greatly appreciated.
> >
> > It depends on the timing of the monitors. The memory reclocking can only
> > occur during blanking periods on the monitors. If the reclocking is done
> > outside of the blanking periods, you will see flickering or artifacts on
> > the display when it happens. If the blanking periods are too short the
> > driver can only downclock memory when the displays are off. Adding more
> > monitors makes this harder as you have to take into account the blanking
> > periods on all monitors. You can try adjusting the modelines used on each
> > display to increase the blanking periods.
> >
> > Alex
